1. In one Terminal ==> gradle bootRun or to run on another port gradle bootRun -PjvmArgs="-Dserver.port=10001". If -Dspring.profiles.active is not given, then the default, development profile is selected.
   • To run a different profile at start-up, use gradle bootRun -Dspring.profiles.active=jenkins.
2. In another Terminal ==>
   • To reload latest classes in the JVM, use gradle compileJava
   • To reload latest changes in static HTML files, use gradle reload
3. In the gradle test mode ==> use gradle bootRun -Dspring.profiles.active=test. This will automatically use the HSQLDB In-memory implementation for running tests. In the development profile, MYSQL is selected.

• Using only Intellij IDE
  • Debugging is as simple as navigating to the class with the main method, right-clicking the triangle icon, and choosing Debug.
• Using another JVM process and Intellij IDE
  1. In one Terminal ==> gradle bootRun -Dserver.port=10001 -Dagentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000

     • Understanding the Java Debug Args - By default, the JVM does not enable debugging. This is because:

       • It is an additional overhead inside the JVM.
       • It can potentially be a security concern for apps that are in public. Hence debugging is only done during development and never on production systems.

       Before attaching a debugger, we first configure the JVM to allow debugging. We do this by setting a command line argument for the JVM: -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000

       • -agentlib:jdwp - Enable the Java Debug Wire Protocol (JDWP) agent inside the JVM. This is the main command line argument that enables debugging.
       • transport=dt_socket - Use a network socket for debug connections. Other options include Unix sockets and shared memory.
       • server=y - Listen for incoming debugger connections. When set to n, the process will try to connect to a debugger instead of waiting for incoming connections. Additional arguments are required when this is set to n.
       • suspend=n - Do not wait for a debug connection at startup. The application will start and run normally until a debugger is attached. When set to y, the process will not start until a debugger is attached.
       • address=8000 - The network port that the JVM will listen for debug connections. Remember, this should be a port that is not already in use.
  2. On Intellij IDE ==>
     • Open menu Run | Edit Configurations...
     • Click the + button and Select 'Remote' from Templates

• Unit Tests
• Integration Tests
• Component Tests
• Contract Tests
• End-To-End Tests

• Domain-level Unit Tests
• Service Layer Unit Tests
• Web-layer (Controller) Unit Tests

For further reference, please consider the following sections:

• Official Gradle documentation
• Spring Boot Gradle Plugin Reference Guide
• Create an OCI image
• Spring Boot DevTools
• Spring Web

The following guides illustrate how to use some features concretely:

• Building a RESTful Web Service
• Serving Web Content with Spring MVC
• Building REST services with Spring

These additional references should also help you:

• Gradle Build Scans – insights for your project's build